I have recently went out on the lake and tried to use my trolling motor and when i turn it on and press the thrust button it turns slow for about 5 seconds then stops entirely and i hear a high pitched whine almost like a dog whistle coming from it?? One thing is that this motor runs off of 2 12v batteries hooked up in parellel and i know the batteries are charged because they have both been tested. I need some advise on what the issue could be and how i may be able to fix it because i cannot for the life of me find anyone that fixes these things anywhere around me. and similar experiences or advise would be greatly appreciated??